Water level control device of humidifier and humidifier using water level control device

ABSTRACT

The present invention exposes a water level control device of a humidifier comprises a water tank and a base of the humidifier, wherein a steam generation cavity is set in the base; the water tank comprises a drain hole with a floating block above; the steam generation cavity is formed with the water level control device that comprises a limiting cover connected with the drain valve in a sleeving mode, a water outlet is formed in the top of the limiting cover with a floating block inside; a leakage hole plug is arranged at the water outlet; when the floating block contacts with the leakage hole plug, the water outlet is blocked for stopping draining; otherwise, the floating block leaves the leakage hole plug, and the water outlet is opened for water supplement. This device can control water supplement in time, users can use it safely.

BACKGROUND OF THE INVENTION

The present invention relates to the field of steam householdappliances, in particular to a water level control device of ahumidifier and a humidifier using the water level control device.

With the development of science and technology, the living standard ofpeople is improved increasingly, and the requirement of people upon theliving environment is improved gradually. Air humidity is one of theimportant factors influencing comfort, particularly in the northern areaof China and in places air conditioners are used for a long time, as theenvironment is extremely dry, corresponding equipment needs to be usedfor increasing the air humidity and providing a comfortable livingenvironment through regulation. Therefore, household humidificationequipment is more and more popular with families and is one ofindispensable household appliances for home furnishing.

A humidifier on the present market is generally composed of a water tankand a base, the base is provided with a steam generation cavity, thewater tank supplies water to the steam generation cavity, and mist isgenerated under the effect of a generator of the base. The humidifier inthe prior art is generally of a downward water adding type, and both awater adding hole and a water outlet valve of the downward water addingtype humidifier are arranged on the bottom of the water tank. Before thedownward water adding type humidifier is used, the water tank needs tobe dismounted from the base firstly, then the water tank is overturnedto make the bottom of the water tank face upwards, the water tank isfilled with water through the water adding hole after the water outletvalve is unscrewed, the water outlet valve is screwed afterwards, thewater tank is mounted on the base again and connected with the steamgeneration cavity, and finally humidification is started. Obviously, thewhole water adding process is extremely complex, the water tank is quiteheavy after being filled with water, and operation is extremelyinconvenient.

For this reason, an upward water adding type humidifier is sold on themarket, before the upward water adding type humidifier is used, watercan be added directly through a water adding cover arranged on the upperportion of a water tank, the water tank does not need to be dismountedany more, and humidification can be started through water addingoperation on the bottom; the upward water adding type humidifier issimple in structure and convenient and easy to use and graduallyreplaces the downward water adding type humidifier accordingly.

As for the upward water adding type humidifier, since the pressureintensity in the water tank is influenced by atmospheric pressure,overflowing easily occurs between the water tank and a base of thehumidifier, and for keeping the normal working state of the humidifier,a water level control device for effectively controlling watersupplement needs to be arranged. A water level control device in theprior art is generally of a lever type or an electromagnetic valve type;as for the lever type water level control device, since a floating blockconnected with one end of a lever needs to be arranged, a large internalspace is occupied by the transversely-arranged lever, the triggeringspeed is low, water supplement cannot be controlled in time, and thewater level control effect is poor; as for the electromagnetic valvetype water level control device, although the response speed is high, aswitch is started frequently due to the fact that triggering isexcessively sensitive and is prone to being damaged consequentially, thestructure is complex, and power consumption is extremely high.Therefore, study on water level control devices for existing upwardwater adding type humidifiers is still a challenge for allmanufacturers.

BRIEF SUMMARY OF THE INVENTION

The present invention aims to provide a novel water level control deviceof a humidifier and a humidifier using the water level control device.The water level control device is simple in structure and small inoccupied space, water supplement control can be conducted in timeaccording to the actual water level condition of a steam generationcavity, the triggering effect is accurate, electric energy is saved, thesituation that overflowing easily happens to the humidifier, or watershortage and dryout occur is effectively avoided, and a user can use thehumidifier safely.

According to the technical scheme adopted by the present invention forachieving the above purpose:

A water level control device of a humidifier comprises a water tank anda base of the humidifier, wherein a steam generation cavity is formed inthe base; the water tank is provided with a drain hole, and a drainvalve is arranged at the drain hole; the steam generation cavity isprovided with the water level control device connected with the drainvalve in a sleeving mode, the water level control device comprises alimiting cover with the circumferential wall being open, a water outletis formed in the top of the limiting cover, and a floating block isarranged inside the limiting cover; a leakage hole plug is arranged atthe water outlet, and the bottom of the leakage hole plug is a contactpart making contact with the floating block; the floating block moves upand down in the limiting cover along with changes of the water level,and when the floating block makes contact with the leakage hole plug,the water outlet is blocked for stopping draining; otherwise, thefloating block is separated from the leakage hole plug, and the wateroutlet is opened for water supplement.

Compared with the prior art, the water level control device of thehumidifier of the present invention is provided with the limiting coverand the floating block arranged between the steam generation cavity andthe drain valve, the circumferential wall of the limiting cover is open,the water outlet is formed in the top of the limiting cover, the leakagehole plug is arranged at the water outlet, and the bottom of the leakagehole plug is a contact part making contact with the floating block. Themovement range of the floating block is limited through the limitingcover, the floating block is made to move up and down in the limitingcover along with changes of the water level in the steam generationcavity, and when the floating block makes contact with the leakage holeplug, the water outlet is blocked for stopping draining; otherwise, thefloating block is separated from the leakage hole plug, and the wateroutlet is opened for water supplement.

Compared with the lever type water level control device, the water levelcontrol device of the present invention is simpler in structure andsmall in occupied space, the floating block is limited by the limitingcover to move up and down along with changes of the water level, thefloating block is matched with the contact part of the leakage hole plugto block or open the water outlet, and thus the draining quantity iscontrolled; in addition, maintenance and replacement are convenient, andthe whole water level control device can be dismounted to be cleanedeasily.

Compared with the electromagnetic valve type water level control device,the water level control device of the present invention is simpler instructure and can save electric energy, water supplement control isconducted in time according to the actual water level condition of thesteam generation cavity, triggering is timely, the situation that aswitch is damaged due to frequent starting is avoided, and both energysaving and environmental friendliness are achieved; in addition,electric connection is reduced, short circuits or electric leakage risksare effectively avoided, and maintenance, replacement, dismounting andcleaning are convenient.

Therefore, according to the water level control device of the humidifierof the present invention, the movement range of the floating block islimited through the limiting cover, and the floating block is matchedwith the leakage hole plug at the water outlet in the limiting cover sothat the water level in the steam generation cavity can be controlledeffectively, water supplement control is conducted in time to guaranteethat the humidifier keeps atomization operation for generating mist, thesituation that overflowing easily happens to the humidifier, or watershortage and dryout occur is effectively avoided, and a user can use thehumidifier safely.

The shape of the limiting cover is further improved, the limiting coveris a cage with the circumferential wall being open and comprises anupper cover, the circumferential wall and a bottom cover, wherein theupper cover is provided with the water outlet, and the circumferentialwall is provided with a water leakage grid; the floating block islimited in the limiting cover to move up and down and makes contact withor is separated from the leakage hole plug at the water outlet throughthe top of the floating block. The whole floating block is wrapped inthe cage-shaped limiting cover with the circumferential wall being open,on the one hand, the limiting cover and the floating block areintegrated so that the limiting cover and the floating block can bedismounted together to be cleaned or replaced and maintained, and on theother hand, since the floating block is limited in the limiting cover tomove up and down, compared with a limiting cover which is only apartially-wrapping cover body structure in the prior art, accuratealignment of the top of the floating block and the leakage hole plug atthe water outlet can be further enhanced, and the coaxiality of the topof the floating block and the leakage hole plug at the water outlet canbe improved easily.

Furthermore, the leakage hole plug is a circular sealing ring and isarranged in the water outlet annularly; the contact part of the leakagehole plug extends downwards, and the shape of the contact part ismatched with the surface contour of the floating block, the contactsurfaces of the floating block and the contact part are integrallymatched and are in contact to seal the water outlet, and thus drainingis stopped.

The shape of the floating block is further improved, a conical end isarranged on the top of the floating block, and the contact part of theleakage hole plug is a flared opening. In practical application, thefloating block moves up and down in the limiting cover along withchanges of the water level, and when the water level rises, the floatingblock moves upwards and makes contact with the contact part of flaredopening through the conical end, and the water outlet is blocked forstopping draining; when the water level falls, the floating block movesdownwards, the end of the floating block is separated from the contactpart, the water outlet is opened, water is supplemented into the steamgeneration cavity, water supplement control is efficiently conductedaccordingly, a proper water quantity in the steam generation cavity isguaranteed, and the situation of overflowing or dryout is avoided.

Furthermore, a groove is formed in the bottom of the floating block, thesize of the limiting cover is matched with that of the floating block,and a positioning column extending upwards is arranged on the bottom ofthe limiting cover; the position of the positioning column is matchedwith that of the contact part, and the positioning column is connectedinto the groove of the floating block in a sleeved mode. For calibratingthe relative positions of the end of the floating block and the contactpart, the structure of the floating block of the water level controldevice of the present invention is improved, the groove is formed in thebottom of the floating block, the positioning column which extendsupwards and is matched with the contact part in position is arranged onthe bottom of the limiting cover, the positioning column is connectedinto the groove of the floating block in the sleeved mode, so that themovement range of the floating block is limited, the floating block isonly allowed to move up and down under the limitation of the limitingcover and is prevented from deviating, the end of the floating block isaccurately aligned to the contact part, and accordingly the water outletis blocked or opened for achieving water level control.

As for another improvement of the shape of the floating block, thefloating block is a spherical floating ball, and the contact part of theleakage hole plug is an arc opening. The floating block in the floatingball shape can make contact with the contact part of the arc openingthrough any spherical surface, and thus the contact area is enlarged;the floating ball can make contact with the contact part of the arcopening through the spherical surface after moving upwards to thecontact part, and the water outlet is blocked; after the water levelfalls, the floating ball moves downwards, the spherical surface isseparated from the contact part, and the water outlet is opened forwater supplement. In this way, the overall structure of the water levelcontrol device is made simpler, cost is reduced, and production qualityis improved.

The present invention further provides a humidifier using the waterlevel control device. The humidifier comprises a shell, wherein a watertank and a base are arranged in the shell, a steam generation cavity anda fan are arranged in the base, and the steam generation cavity isprovided with a generator; the shell is provided with an upper cover,and the upper cover is provided with a mist spraying hole; the watertank is provided with a drain hole, and a drain valve is arranged at thedrain hole; the steam generation cavity is provided with the water levelcontrol device which is connected with the drain valve in a sleevingmode, and the quantity of water entering the steam generation cavity iscontrolled.

Furthermore, the water tank is detachably connected to the base, a mistdischarging bucket is further arranged in the water tank, and a mistoutlet communicating with the mist spraying hole is formed in the top ofthe mist discharging bucket; when the water tank is mounted in the shelland connected with the base, the drain valve is connected with the waterlevel control device in a sleeved mode, and thus the mist dischargingbucket is made to be located above the steam generation cavity. Throughthe design of the detachable water tank, water adding operation by auser is facilitated, the water tank is pulled out for water adding andthen is mounted inside the humidifier for atomization, the situationthat water splashes and overflows out of the humidifier when directlyadded into the humidifier is avoided, and environmental sanitation andusing safety are ensured.

Furthermore, the drain valve comprises a water blocking cover, apositioning ring, a spring and an ejection rod, wherein the positioningring is arranged in the drain hole; the ejection rod penetrates throughthe positioning ring to be connected with the water blocking cover; astress end which can be stressed to drive the ejection rod to move upand down is arranged on the bottom of the ejection rod; the spring isconnected with the ejection rod in a sleeving mode and elastically makescontact with the ejection rod between the positioning ring and thestress end. Since the water tank is detachable, when the water tank isdismounted from the base, the drain valve moves downwards along withgravitational force, the water blocking cover and the ejection rod aremade to move downwards, the drain hole is blocked, and a user cansecurely add water into the water tank.

Based on the above description, an ejection column is further arrangedat the water outlet of the limiting cover; when the water tank isconnected with the base, the ejection column makes contact with thestress end of the ejection rod to eject the ejection rod, and the drainvalve is made to be in an open state. During actual operation, when thewater tank is mounted back onto the base after the user adds water intothe water tank, the ejection column is arranged at the water outlet ofthe limiting cover and makes contact with the stress end of the ejectionrod of the drain valve, the ejection rod is ejected accordingly to makethe drain valve be in the open state, and thus water in the water tankcan enter the water outlet of the limiting cover.

The structure of the water tank is further improved, a filter covercovering the drain valve is further arranged in the water tank, and afilter grid is arranged on the filter cover, so that the situation thatimpurities in the water tank enter the drain valve, and consequentiallyblockage is caused is avoided, and water can be drained more smoothly.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view 1 of a humidifier using a water level controldevice of the present invention;

FIG. 2 is an exploded view 2 of the humidifier of the present invention;

FIG. 3 is a structural view of a floating block, in a first shape, ofthe water level control device of the humidifier of the presentinvention;

FIG. 4 is a structural view 1 of a limiting cover of the water levelcontrol device of the present invention;

FIG. 5 is a structural view 2 of the limiting cover of the water levelcontrol device of the present invention;

FIG. 6 is a structural view of an expansion scheme of the floatingblock, in the first shape, of the water level control device of thepresent invention;

FIG. 7 is a structural view of a floating block, in a second shape, ofthe water level control device of the humidifier of the presentinvention;

FIG. 8 is a sectional view 1 of the humidifier of the present invention;and

FIG. 9 is a sectional view 2 of the humidifier of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Descriptions of a water level control device of a humidifier and ahumidifier using the water level control device of the present inventionare given with accompanying drawings.

As is shown in FIGS. 1-2, a humidifier comprises a shell 1, wherein awater tank 11 and a base 12 are arranged in the shell, a steamgeneration cavity 2 and a fan 13 are arranged in the base 12, and thesteam generation cavity 2 is provided with a generator; the shell 1 isprovided with an upper cover 14, and the upper cover 14 is provided witha mist spraying hole 141; the water tank 11 is provided with a drainhole 110, and a drain valve 3 is arranged at the drain hole 110; thesteam generation cavity 2 is provided with a water level control devicewhich is connected with the drain valve 3 in a sleeving mode, and thequantity of water entering the steam generation cavity 2 is controlled.

As is shown in FIG. 3, the water level control device comprises alimiting cover 4 with the circumferential wall being open, a wateroutlet 41 is formed in the top of the limiting cover 4, and a floatingblock 5 is arranged inside the limiting cover 4; a leakage hole plug 6is arranged at the water outlet 41, and the bottom of the leakage holeplug 6 is a contact part 61 making contact with the floating block 5;the floating block 5 moves up and down in the limiting cover 4 alongwith changes of the water level, and when the floating block 5 makescontact with the leakage hole plug 6, the water outlet 41 is blocked forstopping draining; otherwise, the floating block 5 is separated from theleakage hole plug 6, and the water outlet 41 is opened for watersupplement. In this way, atomization operation of the humidifier is keptfor generating mist, the situation that overflowing easily happens tothe humidifier, or water shortage and dryout occur is effectivelyavoided, and a user can use the humidifier safely.

As is shown in FIGS. 4-5, the limiting cover 4 is preferably a cage withthe circumferential wall being open and comprises an upper cover 401,the circumferential wall 402 and a bottom cover 403, wherein the uppercover 401 is provided with the water outlet 41, and the circumferentialwall 402 is provided with a water leakage grid; the floating block 5 islimited in the limiting cover 4 to move up and down and makes contactwith or is separated from the leakage hole plug 6 at the water outlet 41through the top of the floating block 5. On the one hand, the wholefloating block 5 is wrapped in the cage-shaped limiting cover 4 with thecircumferential wall being open, and the limiting cover 4 and thefloating block 5 are integrated so that the limiting cover 4 and thefloating block 5 can be dismounted together to be cleaned or replacedand maintained; on the other hand, since the floating block 5 is limitedin the limiting cover 4 to move up and down, compared with a limitingcover 4 which is only a partially-wrapping cover body structure in theprior art, accurate alignment of the top of the floating block 5 and theleakage hole plug 6 at the water outlet 41 can be further enhanced, andthe coaxiality of the top of the floating block 5 and the leakage holeplug 6 at the water outlet 41 can be improved easily.

Wherein, as is shown in FIG. 3, the leakage hole plug 6 is a circularsealing ring and is arranged in the water outlet 41 annularly; thecontact part 61 of the leakage hole plug 6 extends downwards, and theshape of the contact part 61 is matched with the surface contour of thefloating block 5, the contact surfaces of the floating block 5 and thecontact part 6 are integrally matched and are in contact to seal thewater outlet 41, and thus draining is stopped.

A conical end 51 is arranged on the top of the floating block 5, and thecontact part 61 of the leakage hole plug 6 is a flared opening. When thewater level rises, the floating block 5 moves upwards and makes contactwith the contact part 61 of the flared opening through the conical end51, and the water outlet 41 is blocked for stopping draining; when thewater level falls, the floating block 5 moves downwards, the end 51 ofthe floating block 5 is separated from the contact part 61, the wateroutlet 41 is opened for water supplement, water supplement control isachieve, a proper water quantity in the steam generation cavity 2 isguaranteed, and the situation of overflowing or dryout is avoided.

For achieving position calibration of the end 51 of the floating block 5and the contact part 61, the structure of the floating block 5 of thewater level control device of the present invention is improved. As isshown in FIG. 6, a groove 52 is formed in the bottom of the floatingblock 5, the size of the limiting cover 4 is matched with that of thefloating block 5, and a positioning column 42 extending upwards isarranged at the bottom of the limiting cover 4; the position of thepositioning column 42 is matched with that of the contact part 61, andthe positioning column 42 is connected into the groove 52 of thefloating block 5 in a sleeved mode to limit the movement range of thefloating block 5, the floating block 5 is only allowed to move up anddown under the limitation of the limiting cover 42 and is prevented fromdeviating, and the end 51 of the floating block 5 is accurately alignedto the contact part 61 to block or open the water outlet 41 forachieving water level control.

According to another embodiment of the shape of the floating block 5 ofthe water level control device of the present invention, as is shown inFIG. 7, the floating block 5 is a spherical floating ball, and thecontact part 61 of the leakage hole plug 6 is an arc opening. Thefloating block 5 in the floating ball shape can make contact with thecontact part 61 of the arc opening through any spherical surface, andthus the contact area is enlarged. The floating block 5 can make contactwith the contact part 61 of the arc opening through the sphericalsurface after moving upwards to the contact part 61, and the wateroutlet 41 is blocked; after the water level falls, the floating ball 5moves downwards, the spherical surface is separated from the contactpart 61, and the water outlet 41 is opened for water supplement. Theoverall structure of the water level control device is made simpler,cost is reduced, and production quality is improved.

On the other hand, the structure of the water tank is optimized, as isshown in FIG. 2, the water tank 11 is detachably connected to the base12, a mist discharging bucket 7 is further arranged in the water tank11, and a mist outlet 71 communicating with the mist spraying hole 141is formed in the top of the mist discharging bucket 7; when the watertank 11 is mounted in the shell 1 and connected with the base 12, thedrain valve 3 is connected with the water level control device in asleeved mode, and thus the mist discharging bucket 7 is made to belocated above the steam generation cavity 2. Through the design of thedetachable water tank 11, water adding operation by a user isfacilitated, the water tank 11 is pulled out for water adding and thenis mounted inside the humidifier for atomization, the situation thatwater splashes and overflows out of the humidifier when directly addedinto the humidifier is avoided, and environmental sanitation and usingsafety are ensured.

Wherein, as is shown in FIG. 8, the drain valve 3 comprises a waterblocking cover 31, a positioning ring 32, a spring 33 and an ejectionrod 34, wherein the positioning ring 32 is arranged in the drain hole110; the ejection rod 34 penetrates through the positioning ring 32 tobe connected with the water blocking cover 31; a stress end 340 whichcan be stressed to drive the ejection rod 34 to move up and down isarranged on the bottom of the ejection rod 34; the spring 33 isconnected with the ejection rod 34 in a sleeving mode and elasticallymakes contact with the ejection rod 34 between the positioning ring 32and the stress end 340. Since the water tank 11 is detachable, when thewater tank 11 is dismounted from the base 12, the drain valve 3 movesdownwards along with gravitational force, the water blocking cover 31and the ejection rod 34 are made to move downwards to block the drainhole 110, and a user can securely add water into the water tank 11.

Based on the above description, an ejection column 43 is furtherarranged at the water outlet 41 of the limiting cover 4; when the watertank 11 is connected with the base 12, the ejection column 43 makescontact with the stress end 340 of the ejection rod 34 to eject theejection rod 34, and the drain valve 3 is made to be in an open state.During actual operation, when the water tank 11 is mounted back onto thebase 12 after the user adds water into the water tank 11, the ejectioncolumn 43 is arranged at the water outlet 41 of the limiting cover 4 andmakes contact with the stress end 340 of the ejection rod 34 of thedrain valve 3, the ejection rod 34 is ejected accordingly to make thewater blocking cover 31 open the drain hole 110 the drain valve 3 ismade in the open state, and thus water in the water tank 11 can enterthe water outlet 41 of the limiting cover 4.

Preferably, as is shown in FIG. 9, a filter cover 8 covering the drainvalve 3 is further arranged in the water tank 11, and a filter grid 81is arranged on the filter cover 8, so that the situation that impuritiesin the water tank 11 enter the drain valve 3, and consequentiallyblockage is caused is avoided, and water can be drained more smoothly.

Those skilled in the art can change and modify the above embodimentaccording to the disclosure and instruction in the description.Therefore, the present invention is not limited to the specificembodiment disclosed and described in the description, and certainmodifications and changes of the present invention also should be withinthe protection scope of the claims of the present invention. Inaddition, although certain terms are used in the description, theseterms are only used for a convenient introduction and do not limit thepresent invention at all.

1: A water level control device of a humidifier, comprising a water tankand a base of the humidifier, wherein a steam generation cavity isformed in the base, the water tank is provided with a drain hole, and adrain valve is arranged at the drain hole; characterized in that thesteam generation cavity is provided with the water level control deviceconnected with the drain valve in a sleeving mode, the water levelcontrol device comprises a limiting cover with the circumferential wallbeing open, a water outlet is formed in the top of the limiting cover,and a floating block is arranged inside the limiting cover; a leakagehole plug is arranged at the water outlet, and the bottom of the leakagehole plug is a contact part making contact with the floating block; thefloating block moves up and down in the limiting cover along withchanges of the water level, and when the floating block makes contactwith the leakage hole plug, the water outlet is blocked for stoppingdraining; otherwise, the floating block is separated from the leakagehole plug, and the water outlet is opened for water supplement. 2: Thewater level control device according to claim 1, characterized in thatthe limiting cover is a cage with the circumferential wall being openand comprises an upper cover, the circumferential wall and a bottomcover, wherein the upper cover is provided with the water outlet, andthe circumferential wall is provided with a water leakage grid; thefloating block is limited in the limiting cover to move up and down andmakes contact with or is separated from the leakage hole plug at thewater outlet through the top of the floating block. 3: The water levelcontrol device according to claim 1, characterized in that the leakagehole plug is a circular sealing ring and is arranged in the water outletannularly; the contact part of the leakage hole plug extends downwards,and the shape of the contact part is matched with the surface contour ofthe floating block. 4: The water level control device according to claim3, characterized in that a conical end is arranged on the top of thefloating block, and the contact part of the leakage hole plug is aflared opening. 5: The water level control device according to claim 4,characterized in that a groove is formed in the bottom of the floatingblock, the size of the limiting cover is matched with that of thefloating block, and a positioning column extending upwards is arrangedon the bottom of the limiting cover; the position of the positioningcolumn is matched with that of the contact part, and the positioningcolumn is connected into the groove of the floating block in a sleevedmode. 6: The water level control device according to claim 3,characterized in that the floating block is a spherical floating ball,and the contact part of the leakage hole plug is an arc opening. 7: Ahumidifier, comprising a shell, wherein a water tank and a base arearranged in the shell, a steam generation cavity and a fan are arrangedin the base, and the steam generation cavity is provided with agenerator; the shell is provided with an upper cover, and the uppercover is provided with a mist spraying hole; the water tank is providedwith a drain hole, and a drain valve is arranged at the drain hole;characterized in that the steam generation cavity is provided with thewater level control device according to claim 1, and the water levelcontrol device is connected with the drain valve in a sleeving mode andcontrols the quantity of water entering the steam generation cavity. 8:The humidifier according to claim 7, characterized in that the watertank is detachably connected to the base, a mist discharging bucket isfurther arranged in the water tank, and a mist outlet communicating withthe mist spraying hole is formed in the top of the mist dischargingbucket; when the water tank is mounted in the shell and connected withthe base, the drain valve is connected with the water level controldevice in a sleeved mode, and accordingly the mist discharging bucket islocated above the steam generation cavity. 9: The humidifier accordingto claim 8, characterized in that the drain valve comprises a waterblocking cover, a positioning ring, a spring and an ejection rod, andthe positioning ring is arranged in the drain hole; the ejection rodpenetrates through the positioning ring to be connected with the waterblocking cover; a stress end which is stressed to drive the ejection rodto move up and down is arranged on the bottom of the ejection rod; thespring is connected with the ejection rod in a sleeving mode andelastically makes contact with the ejection rod between the positioningring and the stress end. 10: The humidifier according to claim 9,characterized in that an ejection column is further arranged at thewater outlet of the limiting cover; when the water tank is connectedwith the base, the ejection column makes contact with the stress end ofthe ejection rod to eject the ejection rod, and the drain valve is madeto be in an open state. 11: The humidifier according to claim 7,characterized in that a filter cover covering the drain valve is furtherarranged in the water tank, and a filter grid is arranged on the filtercover.